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Up On The Roof (November 1999)

Rooftop packaged systems are normally designed to handle a building's total cooling and heating loads at design weather conditions, which are based on climate extremes at the building's location. Unfortunately, according to the American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE), design conditions rarely occur during the year - only 2.5% to 5% of the time, making many rooftop systems inefficient.

The challenge, then, is selecting a packaged rooftop unit that can handle the peak design cooling load and also maintain control of indoor comfort during the non-peak times of the year.

Events

In the summer of 2014 the United Association (UA) started a new course to teach their membership the use of laser scanning equipment and related software to create highly accurate three-dimensional point clouds of existing buildings and mechanical systems for the use with BIM applications. Pat Ramirez and Erik Lambrecht were tasked to create the new course which lead to a partnership with FARO.

While the basic concept and need of backup power systems has not changed, the increased likelihood of power outages has put greater reliance on backup power systems, making the their reliability more important than ever. When a utility outage occurs, the backup generator is expected to immediately start and support the load; however, even the best emergency backup power system, utilizing the highest-quality equipment, can be rendered useless if not properly maintained.

Engineered Systems magazine’s September 2019 issue questions the need for multiple building codes that cover the same subjects, examines the dos and don’ts of power systems for critical facilities, offers tips on how to select the proper centrifugal pump circuit flow controls, and much more.